$ git clone -n https://src.fedoraproject.org/rpms/rhc.git /var/lib/mock/f45-build-34514-687/root/chroot_tmpdir/scmroot/rhc
Cloning into '/var/lib/mock/f45-build-34514-687/root/chroot_tmpdir/scmroot/rhc'...
$ git fetch origin 1ff57ee5f7663ded9dc57f98f1d3b7412791f924:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rhc
 * [new ref]         1ff57ee5f7663ded9dc57f98f1d3b7412791f924 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ff57ee Update to 0.3.12